//detect browser:
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer >= 3) browserVer = "1";
else if (browserName == "Microsoft Internet Explorer" && browserVer == 4) browserVer = "1";
else browserVer = "2";

function ajaxRequest(){
	var activexmodes=["Msxml2.XMLHTTP", "Microsoft.XMLHTTP"]; //activeX versions to check for in IE
	if (window.ActiveXObject){ //Test for support for ActiveXObject in IE first (as XMLHttpRequest in IE7 is broken)
            for (var i=0; i<activexmodes.length; i++){
                try{
                    return new ActiveXObject(activexmodes[i])
                }
                catch(e){
                    //suppress error
                }
            }
	}
	else if (window.XMLHttpRequest) // if Mozilla, Safari etc
            return new XMLHttpRequest();
	else
            return false;
}

//image swapping function:
function hiLite(imgDocID, imgObjName, comment) {
        var bool;
	if (browserVer == 1) {
		document.images[imgDocID].src = eval(imgObjName + ".src");
		window.status = comment; 
                bool = true;
	}else{
            bool = false;
        }
        return bool;
}

function validateregistration(form) {
    var name = form.name.value;
    var address = form.address.value;
    var city = form.city.value;
    var postcode = form.postcode.value;
    var telp = form.telp.value;
    var hp = form.hp.value;
    var fax = form.fax.value;
    var email = form.email.value;
    var username = form.username.value;
    var passwords = form.passwords.value;
    var confirmpassword = form.confirmpassword.value;
    
    var nameRegex = /^[a-zA-Z]+([\s][a-zA-Z]+)*$/;
    var usernameRegex = /^[a-zA-Z0-9._]+$/;
    var photoRegex = /^.+\.(jpe?g|bmp|png)$/i;
    var emailRegex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;
    var phoneRegex = /^((\+\d{1,3}(-| )?\(?\d\)?(-| )?\d{1,5})|(\(?\d{2,6}\)?))(-| )?(\d{3,4})(-| )?(\d{4})(( x| ext)\d{1,5}){0,1}$/;
    if(name == ''){
        inlineMsg('name','Name must be filled',2);
        return false;
    }
    if(!(name.match(nameRegex))){
	inlineMsg('name','Invalid name. Only letters and numbers allowed',2);
        return false;
    }
    if(address == ''){inlineMsg('address','Address must be filled',2);return false;}
    if(city == ''){inlineMsg('city','City must be filled',2);return false;}
    if(postcode == ''){inlineMsg('postcode','Postcode must be filled',2);return false;}
    if(telp == ''){inlineMsg('telp','Telp must be filled',2);return false;}
    if(hp == ''){inlineMsg('hp','Hp must be filled',2);return false;}
    if(fax == ''){inlineMsg('fax','Fax must be filled',2);return false;}
    if(email == ''){inlineMsg('email','Email must be filled',2);return false;}
    if(!(email.match(emailRegex))){inlineMsg('email','Invalid email. Email format is someting@something.something',2);return false;}
    if(username==''){inlineMsg('username','Username must be filled',2);return false;}
    if(passwords=='' || passwords.length<6){inlineMsg('passwords','Password must have minimal 6 characters',2);return false;}
    if(confirmpassword != passwords){inlineMsg('confirmpassword','Your password does not match',2);return false;}
    return true;
}
function validateusername(username){
    var mypostrequest=new ajaxRequest();
    var parameters="username="+username.value;
    mypostrequest.open("POST", "validateusername", true);
    mypostrequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    mypostrequest.setRequestHeader("Content-length", parameters.length);
    mypostrequest.setRequestHeader("Connection", close);
    mypostrequest.send(parameters);
    mypostrequest.onreadystatechange=function(){
        if (mypostrequest.readyState==4){
            if (mypostrequest.status==200 || window.location.href.indexOf("http")==-1){
                //document.getElementById("result").innerHTML=mypostrequest.responseText;
                if(mypostrequest.responseText=='exist'){
                    inlineMsg('username','Username has existed');
                    return false;
                }else if(mypostrequest.responseText=='notexist'){
                    return true;
                }
            }
            else{
                return false;
            }
        }
    }
}
// START OF MESSAGE SCRIPT //

var MSGTIMER = 20;
var MSGSPEED = 5;
var MSGOFFSET = 3;
var MSGHIDE = 3;

// build out the divs, set attributes and call the fade function //
function inlineMsg(target,string,autohide) {
  
  var msg;
  var msgcontent;
  if(!document.getElementById('msg')) {
    msg = document.createElement('div');
    msg.id = 'msg';
    msgcontent = document.createElement('div');
    msgcontent.id = 'msgcontent';
    document.body.appendChild(msg);
    msg.appendChild(msgcontent);
    msg.style.filter = 'alpha(opacity=0)';
    msg.style.opacity = 0;
    msg.alpha = 0;
  } else {
    msg = document.getElementById('msg');
    msgcontent = document.getElementById('msgcontent');
  }
  msgcontent.innerHTML = string;
  msg.style.display = 'block';
  var msgheight = msg.offsetHeight;
  var targetdiv = document.getElementById(target);
  targetdiv.focus();
  var targetheight = targetdiv.offsetHeight;
  var targetwidth = targetdiv.offsetWidth;
  var topposition = topPosition(targetdiv) - ((msgheight - targetheight) / 2);
  var leftposition = leftPosition(targetdiv) + targetwidth + MSGOFFSET;
  msg.style.top = topposition + 'px';
  msg.style.left = leftposition + 'px';
  clearInterval(msg.timer);
  msg.timer = setInterval("fadeMsg(1)", MSGTIMER);
  if(!autohide) {
    autohide = MSGHIDE;  
  }
  window.setTimeout("hideMsg()", (autohide * 1000));
}

// hide the form alert //
function hideMsg(msg) {
  var msg = document.getElementById('msg');
  if(!msg.timer) {
    msg.timer = setInterval("fadeMsg(0)", MSGTIMER);
  }
}

// face the message box //
function fadeMsg(flag) {
  if(flag == null) {
    flag = 1;
  }
  var msg = document.getElementById('msg');
  var value;
  if(flag == 1) {
    value = msg.alpha + MSGSPEED;
  } else {
    value = msg.alpha - MSGSPEED;
  }
  msg.alpha = value;
  msg.style.opacity = (value / 100);
  msg.style.filter = 'alpha(opacity=' + value + ')';
  if(value >= 99) {
    clearInterval(msg.timer);
    msg.timer = null;
  } else if(value <= 1) {
    msg.style.display = "none";
    clearInterval(msg.timer);
  }
}

// calculate the position of the element in relation to the left of the browser //
function leftPosition(target) {
  var left = 0;
  if(target.offsetParent) {
    while(1) {
      left += target.offsetLeft;
      if(!target.offsetParent) {
        break;
      }
      target = target.offsetParent;
    }
  } else if(target.x) {
    left += target.x;
  }
  return left;
}

// calculate the position of the element in relation to the top of the browser window //
function topPosition(target) {
  var top = 0;
  if(target.offsetParent) {
    while(1) {
      top += target.offsetTop;
      if(!target.offsetParent) {
        break;
      }
      target = target.offsetParent;
    }
  } else if(target.y) {
    top += target.y;
  }
  return top;
}

function confirmDelete(link){
    if (confirm("Continue deleting articles ?")) {
            doAjax(link.href, "POST"); // doAjax needs to send the "confirm" field
    }return false;
}

// preload the arrow //
if(document.images) {
  arrow = new Image(7,80); 
  arrow.src = "..images/msg_arrow.gif"; 
}
